Valve



(No Model.)

VALVE.

- Patented Nov. 13, 1883;

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UNITED STATES PATENT OFFICE.

RICHARD LAUCHNER, or BAY CITY, MICHIGAN.

VALVE.

p SPEGIFICATIONforming part'of Letters Patent No. 288,350, datedNovember 13, 1883.

i Application nieu January s1', icas. (No model.)

To @ZZ whomimoty concern.-

Beit known that I, RICHARD LAUCKNER, of Bay City, in the county of Bayand State of Michigan, have invented new and useful Improvements inValves; and I hereby declare that the following is a full, clear, andexact description thereof, reference being had to the accompanyingdrawings, which form a part of this specification. Y

This invention relates to that class of valves commonly called rotary`valves; and the invention consists in the peculiar and novel shape ofthevalve face and seat, bymeans of which the valve is kept steam or watertight during a long period of use without the necessity of refacing it,and without the use of any packing whatever, all as more fullyhereinafter described.

Figurel is a vertical central section of my improved valve, takenthrough the axis of the inlet and outlet couplings. Fig. `2 isa-horizontal section on line XX. Fig. 3 is a vertical central section of`the valve, taken at right angles to the one in FigQl. Fig. 4 isadiagram section of my improved valve-face and of the ordinary conicalone.

In the accompanying drawings, A repre-` sents the lower and B the upperhalf of the valve-shell, each provided with a correspond ing annularring, a, by means .of which the two halves can be fitted togethersteam-tight.

C is the inlet and D the outlet coupling.

E is the valve` proper. Its face is conoidal, and `has been generated bythe concave line F, which shows the valve-face in section.

b b are two ports in the valve, diametrically opposite each `other andcorresponding with two ports, c c, in thevalve-seat G. The two portsclead into ducts d, cast in the upper `valve-shell, andleading both intothe outletcoupling D. f In the drawings the valve-seat G is castintegral with the upper half of the shell, and is of proper shape to fitthe face of the valve steam-ti ht. i H is the valve-stem, and I thevalve-handle, by means of which it can be rotated.

` K isa nut which secures the handle upon the stem and allows the valvetobe tightened to its seat.

In practice the valve is opened by making the ports Zi and c coincide.It has been demonstrated in practice that in all rotary valves where thevalve-face is either a plane disk or a cone the valve begins to leakafter having been in `use some time, and this isentirely owing to theunequal wear of the valve-face upon its seat when in operation, as theparts farther away from the center of rotation have to traverse part ofa larger circle than those nearer the center. Theresult is that thevalveface gets more worn awaynearer the edges than toward the center,and nothing but refacing can Vmake it steam-tight.

In the diagram in Fig. 4, I show my improved valve-face and an ordinaryconical one, the lower lines showing the worn faces of each. It is clearthat the conical face, after it is Worn, will not flt its seatsteam-tight; but

my valve-face, after being worn off, may be'` perfectly parallel tg theoriginal face, providing its concavo generating curve has been properlyselected, which may easily be done by the constructer, if he proportionshis curve so as to make up for the loss of travel toward the center ofthe valve by a corresponding comparative increase of thewearing-surface.

It is clear that the material of which the valve and valve-seat aremadedoes not affect the question of unequal wear. In practice both thevalve-seat and the valve-face will wear off, but it is clear that if oneis adjusted to `wear off evenly the other will Ido the same.

What I claim as my invention 'is- In a rotary valve, the parts A and B,the former having the ,inlet-coupling C, and the latter having the portsc c, water-way d, connecting said ports and outlet-coupling D, combinedwith the conoidal valve E, having ports b b, arranged to register withthe ports. c c when the cock is open, and adapted to close the saidports by a quarter-turn of the valve- 'stem H, as set forth.

RICHARD LAUGKNER.

Witnesses:4

H. S. SPRAGUE, E. SCULLY.

